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Almgjotheii, Flatestøl, Lund, Rogaland, Norway

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Latitude & Longitude (WGS84): 58° 32' 59'' North , 6° 31' 0'' East
Latitude & Longitude (decimal): 58.55, 6.51666666667
Name(s) in local language(s):Almgjotheii (Almjotheia), Flatestøl, Lund kommune, Rogaland fylke, Norge
Other regions containing this locality:Scandinavia

A grandidierite-boralsilite bearing abyssal pegmatite in the Rogaland anorthosite complex intruded in high-grade granulites located about 2 km N of Moi. It occurs as a discordant, nearly vertical vein 10 m long and 10 cm wide hosted in pelitic rocks (gneises containing garnet, cordierite spinel, sillimanite) resulting from metamorphism under granulite-facies condition (Grew et al. 1998).

The host rocks:
Almandine migmatites (partially melted metapelites) within granulites at the contact of intrusive anorthosites (Bjerkrem-Sokndal layered lopolith) show hercynite-quartz and osumilite high-grade assemblages (750 °C-4 kb, up to 1050 °C at the anorthosite contact).

Mineral List

17 valid minerals. 1 (TL) - type locality of valid minerals.

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Huijsmans, J.P.P., Barton, M. & van Bergen, M.J. (1982): A pegmatite containing Fe-rich grandidierite, Ti-richdumortierite and tourmaline from the Precambrian, high-grade metamorphic complex of Rogaland, S-W.Norway. Neues Jahrbuch für Mineralogie, Abhandlungen 133 (3): 249-261

Waters, D. J. (1991): Hercynite-quartz granulites; phase relations, and implications for crustal processes. European Journal of Mineralogy 3: 367-386.

Grew, E.S., McGee, J.J., Yates, M.G., Peacor, D.R., Rouse, R.C., Huijsmans, J.P.P., Shearer, C.K., Wiedenbeck, M., Thost, D.E., and Su, S.-C. (1998): Boralsilite (Al16B6Si2O37): A new mineral related to sillimanite from pegmatites in granulite-facies rocks. American Mineralogist: 83: 638-651.

Grew, E. S.; Yates, M. G. ; Huijsmans, J. P. P. ; McGee, J. J.; Shearer, C. K.; Wiedenbeck, M. & Rouse, R. C. (1998): Werdingite, a borosilicate new to granitic pegmatites, The Canadian Mineralogist 36, 399-414.

Kristiansen, R. (2000): Nytt om mineraler. Borasilite-Al16B6Si2O37- et nytt mineral fra Antarktis og Norge! Stein 27 (1): 33.

Kristiansen, R. (2012): Almgjotheii-en sjelden borosilikatpegmatitt i Rogaland. Norsk Bergverksmuseum Skrifter. 49, 81-92

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